Ios 如何使Http get请求URL由swift 3中的管道组成？

我收到了swift 3的get请求。该url具有管道。如果没有管道，它可以正常工作，但是当我添加管道时，代码会在展开可选值错误时中断，说find nil

这是我的网址 让url=url（字符串：“”）

这是我的密码：

func synchronusGetRequstForExternalAPI(api_url:String, headers:[ String: String]) -> ResultModel {

        let resultModel = ResultModel()

        //create the url with URL
        let url = URL(string:"https://maps.googleapis.com/maps/api/directions/json?origin=colombo&destination=kandy&waypoints=optimize:true|&key=AIzaSyCNBcQLIVvNwqjkYiLawnYK_OK4EQbRM5M")
        //create the URLRequest object using the url object
        var request = URLRequest(url: url!)

        //set headers
        for item in headers {
            request.addValue(item.value, forHTTPHeaderField: item.key)
        }

        let semaphore = DispatchSemaphore(value: 0)
        let task = URLSession.shared.dataTask(with: request as URLRequest) {
            (data, response, error) in


            if(error != nil){
                resultModel.ErrorType = .NO_INT
                resultModel.JsonReslut = JSON.null

            }else{

                if let resp = response as? HTTPURLResponse{
                    if(resp.statusCode == 200){
                        if let jsonResult = JSON(data) as? JSON {

                            resultModel.ErrorType = .NO_ERROR
                            resultModel.JsonReslut = jsonResult
                        }
                    }else{
                        if let jsonResult = JSON(data) as? JSON {

                            resultModel.ErrorType = .SEREVR_ERROR
                            resultModel.JsonReslut = jsonResult
                        }else{
                            resultModel.ErrorType = .SEREVR_ERROR
                            resultModel.JsonReslut = JSON.null
                        }
                    }
                }
            }

            semaphore.signal()
        }
        task.resume()
        _ = semaphore.wait(timeout: DispatchTime.distantFuture)

        return resultModel
    }

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有人能告诉我为什么会发生这种情况吗？

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是URL中不允许的字符。尝试转义URL字符串

let url = URL(string:"https://maps.googleapis.com/maps/api/directions/json?origin=colombo&destination=kandy&waypoints=optimize:true|&key=AIzaSyCNBcQLIVvNwqjkYiLawnYK_OK4EQbRM5M".stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLFragmentAllowedCharacterSet()))

---

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不是URL中允许的字符。尝试转义URL字符串

let url = URL(string:"https://maps.googleapis.com/maps/api/directions/json?origin=colombo&destination=kandy&waypoints=optimize:true|&key=AIzaSyCNBcQLIVvNwqjkYiLawnYK_OK4EQbRM5M".stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLFragmentAllowedCharacterSet()))